Pneumatic player-action for pianos



lC. E. PETERSON.

PNEUMATIC PLAYER ACTION FOR PIANOS.

'APPLICATION HLED MAY 2B. |919.

1 ,5330,340. v Patented. Feb; 10, 1920.

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CLAUS E. PETERSON, 0F WORCESTER, MASSACHUSETTS.

PNEUMATIC PLAYER-ACTION FOR PIANOS.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed May 28, 1919. Serial No. 300,284.

To all whom t may concern:

Be it known that I, CLAUS E. PETERSON, a citizen of the United States,residing'at Worcester, in the county of Vorcester and Commonwealth ofMassachusetts, have invented a new and useful Improvement in PneumaticPlayer-Actions for Pianos, of which the following, together with theaccompanying drawings, is a specification.

My present improvement relates particularly to the construction of ableed device for the pneumatic player actions of pianos, as hereinafterdescribed, the features of novelty being pointed out in the appendedclaims.

Referring to the accompanying drawings,

Figure 1 represents so much of a pneumatic player action for pianos asis necessary to illustrate the nature of my present invention, portionsbeing shown in sectional view.

Fig. 2 is a front view of the bleed mechanism.

the broken line- 3-3, Fig. 2.

Similar reference characters referl to similar parts in the differentfigures.

Referring to Fig. 1 of the drawings, 1 denotes a tracker bar of theusual form of construction, shown in sectional view. 2 is a pipe leadingfrom `the tracker bar tothe bleed device, shown at 3. 4 is a pipeleading from the bleed device of a pneumatic valve mechanism,represented at 5, Fig. l. The

bleed device consists of a tube preferably rectangular in cross sectionand inclosing a chamber 6 connected with an air exhausting mechanism,not shown, through a pipe 7 whereby a partial vacuum is maintained inthe chamber 6. The pipe 2 passes through the chamber 6 with its endattached to one of the side walls of the chamber. They interior of thepipe 2 communicates with a chamber 8 inclosed in a cap 9 provided with aflange 10, which is attached tothe side of the tube by screws 11, 11,held in the tube 3 and having their heads overlapping the edges of theflange 10. The pipe 4 enters the chamber 8, as shown in sectional view Fig. 3 is a sectional view on the plane ofy in Fig. 3, and an opening 12in the side wall of the rectangular tube 3 establishes communicationbetween the chamber 8 inllosid in the ,cap 9and the vacuum chamer Whenan opening in the tracker bar is uncovered by a perforation of t-hemusic sheet, air passes through the pipes 2 and 4 to actuate thepneumatic valve mechanism, in the manner common to devices of thisclass. When the opening in the tracker bar is closed by the music sheet,the air remaining in the tubes 2 and 4 passes through the restrictedbleed opening 12 into the vacuum chamber 6.

I claim,

1. The combination with a pneumatic player action fora piano, of a bleeddevice comprising a closed vacuum tube, va pipe passing through saidtube and having an open end terminating outside said tube, a capcovering the open end of said pipe and attached to said tube, Valrestricted Aopening in said tube communicating with the interior ofsaid cap, and a pipe leading from said cap to the valve mechanism of theplayer action.

2. In a pneumatic player action, a bleed device comprising a pipe havingan open end, a cap inclosing a chamber and. covering the open end ofsaid pipe, a vacuum chamber, and a communication between the chamberinclosed in said cap and said vacuum chamber. i

3. In an apparatus of the class described, a tracker bar, a tubeinclosing a vacuum chamber, a pipe leading from the tracker bar andpassing through said vacuum chamber and having an end opening outsidethe vacuum chamber, a cap inclosing the open end of said pipe, and arestricted opening between the vacuum chamber and the in.

terior of said cap.

Dated this 23rd day of May, 1919.

l CLAUS E. PFIERSON.`

, Witnesses:

NELLIE WHALEN, PENELOPE COMBERBACH.

